# Plumber or Electrician for a Water Heater? | KL Plumbing Handbook

> Leaks and weak flow are plumber jobs; tripping and no power are electrician jobs. How to route a water heater fault to the right trade.

URL: https://klplumbing.my/guide/plumber-or-electrician-water-heater/
Last-Modified: 2026-11-15
Author: KL Plumbing Handbook editors

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## Two trades, one appliance

Most KL homeowners find out the hard way that a water heater sits right between two trades. Water flows through it, and electricity heats it.

At KL Plumbing Handbook, we get one question a lot: plumber or electrician for water heater faults? The short answer is that water-side faults go to a plumber, and power or heating faults go to a qualified electrician.

Call the wrong trade and you pay a visit fee for a diagnosis instead of a fix. Some jobs need both, and a few faults could be either.

Below, we sort the common faults into water-side and electrical, cover the jobs that need both trades, and show how to work out who fixes a water heater that’s not heating. For heater faults in general, see the 

Water Heaters section

[/water-heaters/ →](/water-heaters/)

.

## Water-side faults: call a plumber

Call a plumber when the problem is about water getting in, flowing through, or leaking out:

-   **Leaks** at the pipe joints, flexible hoses or valves connected to the heater
-   **Weak flow** through the heater or the shower
-   **Water dripping** from a storage heater’s pressure relief valve
-   **Pipe problems,** such as unsuitable pipe material on the hot side
-   **Moving or replacing** the pipes when a heater is relocated

Flow matters more than most people expect. Rheem Malaysia lists low hot water pressure as the most common complaint with instant heaters, because they need enough flow to switch the heating on. Many Malaysian instant heater spec sheets quote a minimum around 0.2 bar (20 kPa), and some list roughly 2 litres a minute to trigger the flow switch.

A leak from the tank body itself is a different story. Rheem Malaysia notes that storage tank leaks usually come from internal corrosion, pressure build-up or a cracked tank, and that is often a replacement job, not a repair.

Before a plumber touches the heater, switch it off at its switch and the breaker.

![Shower head with weak trickling flow in a Malaysian bathroom](/images/content/shower-head-with-weak-trickling-flow-in-a-malaysia.webp)

## Electrical faults: call a qualified electrician

Call a qualified electrician when the problem is about power, heating or safety:

-   **Tripping** the ELCB, RCCB or circuit breaker
-   **No power,** with no light or indicator on the heater
-   **No heating** with good flow and power on
-   **Burning smell,** scorch marks or a hot switch
-   **Faulty switch** or loose wiring
-   **New circuit** or upgraded wiring for a bigger heater

If the water flows well but never gets hot, the culprit is usually the heating element or thermostat. Rheem Malaysia names both as the typical causes of no hot water in storage heaters, and the same logic applies to the controls in an instant unit.

A burning smell or a hot switch is a stop-now sign. Turn the heater off at the breaker and call someone qualified the same day.

Never open a heater casing or work on wiring yourself.

## Jobs that need both

Installing, replacing or moving a heater needs a plumber and an electrician, each doing their own part. The table shows who handles what.

| Job | Plumber | Qualified electrician |
| --- | --- | --- |
| Installing a new heater | Mounts the heater, connects pipes, tests for leaks | Connects wiring, switch and earth, checks the circuit |
| Replacing an old heater | Disconnects and reconnects pipes | Disconnects and reconnects power safely |
| Water leaking into the heater | Fixes the leak | Checks the heater is safe to use |
| Moving a heater | Reroutes pipes | Reroutes the power supply |
| Adding a booster pump for the heater | Fits the pump and pipes | Wires the pump |

Agree who does what before the day. Two trades turning up with each assuming the other will test the connection is how small leaks and loose terminals get missed.

![Two people discussing a newly mounted instant water heater in a Malaysian bathroom with pipe fittings and a wall switch visible](/images/content/two-people-discussing-a-newly-mounted-instant-wate.webp)

## The lukewarm water puzzle

Lukewarm water can be either a water-side or an electrical fault, so check the flow first. Three quick checks usually settle who fixes a water heater that’s not heating.

1.  **Check the flow.** Turn the shower to full. Is the flow weak? An instant heater may not be getting enough water to switch its heating on properly, or it may be cutting in and out. That points to pressure, a blocked filter or shower head, or the supply, so a plumber is the right start. Our guide on 
    
    instant versus storage water heaters
    
    [/guide/instant-vs-storage-water-heater/ →](/guide/instant-vs-storage-water-heater/)
    
     explains why flow matters.
2.  **Check the setting.** Is the temperature knob turned up?
3.  **If flow and setting are fine** and the water is still lukewarm, the element or controls are likely faulty. That is electrical.

Try the quick checks before you book anyone. A clogged shower head is a five-minute fix, and it saves a call-out.

## Landed house and condo notes

**Landed house.** Heaters in landed houses are often fed from a roof tank, sometimes through a booster pump. Gravity gives roughly 9.8 kPa for every metre of height, so a tank only 2 metres above the heater delivers about 20 kPa, right at the minimum many instant heaters list. Weak flow may come from the tank height, the pipe size or the pump, which are all plumbing questions. The 

Water Pressure section

[/water-pressure/ →](/water-pressure/)

 covers those.

**Condo unit.** Most condo bathrooms use instant heaters fed by the building supply. If several units have weak hot showers at the same time, ask building management about the building’s pumps before calling anyone. For work inside your unit, check whether building rules limit contractor hours.

**Rented homes.** Report heater faults to the landlord or agent in writing. The heater is usually part of the owner’s fittings, so the owner normally arranges the repair unless it was damaged by misuse.

## Safety first, whichever trade

Switch the heater off before anyone works on it, and never let anyone bypass the safety trip.

-   Switch the heater off at its switch and the breaker before anyone works on it.
-   Do not let anyone bypass the ELCB or RCCB to “test” the heater.
-   Ask the electrician to confirm the heater is properly earthed.
-   Buy heaters that carry the SIRIM label and are approved for sale in Malaysia.

Suruhanjaya Tenaga (the Energy Commission) regulates electrical equipment safety. It covers 34 categories of household electrical products, which must carry the ST-SIRIM label before they can be sold. Suruhanjaya Tenaga has also published a guideline on the design, installation, inspection, testing and maintenance of water heater systems, which a competent electrician should know.

## Permits and qualifications

Each trade has its own licence, so ask about both before work starts.

| Trade | What to look for |
| --- | --- |
| Plumber | An IPA Type A permit from SPAN, needed for work on pipes carrying water from the public mains |
| Electrician | A qualified, registered electrical contractor or competent person registered with Suruhanjaya Tenaga |

SPAN’s IPA Type A permit covers building, connecting, modifying and repairing water pipes and fittings that carry mains water. On the electrical side, Suruhanjaya Tenaga requires contractors to hold a valid certificate of registration before they carry out electrical work.

Our 

hiring checklist

[/hiring-a-plumber/ →](/hiring-a-plumber/)

 covers how to check both.

## When to call a plumber

For the plumber or electrician for water heater question, use this rule. Call a plumber for leaks, weak flow through the heater and the pipe side of any installation or replacement. Call a qualified electrician for tripping, no power, no heating and any wiring.

For a new heater, ask whether the provider covers both trades, or book them separately and agree who does what before the day. If you’re unsure which fault you have, run the three lukewarm checks first, then call the trade they point to.

info This guide is general information, not legal or professional advice. Rules and building house rules vary, so confirm the details with building management, SPAN, Air Selangor or a qualified person before you act.

## Questions people ask

My heater gives lukewarm water. Who do I call?expand\_more

Check the flow first. If the water flow through the heater is weak, it may not heat properly, which is a water-side issue a plumber can look at. If the flow is fine and the water is still lukewarm, the heating element or controls are likely at fault, which is usually electrical.

Who installs a new heater?expand\_more

Often a plumber fits the heater and connects the pipes, and a qualified electrician handles the wiring, switch and connection to the circuit. Some providers bring both. Ask who will do each part.

Who fixes a leaking heater?expand\_more

A plumber, after the power is switched off. If water has got into the heater's casing or switch, an electrician should check it is safe before it is switched back on.

Can a handyman do it?expand\_more

Not for the electrical side. Wiring a water heater needs a qualified person. For pipes carrying water from the public mains, a plumber with a SPAN IPA Type A permit is needed.

Keep reading

Learn more about water heaters

Instant and storage heaters, safe installation, common faults, repair or replace.

Open the Water Heaters section

[/water-heaters/ →](/water-heaters/)

About the authors

KL Plumbing Handbook editors

The KL Plumbing Handbook editors write plain-language guides on home plumbing problems, repair costs and hiring a plumber for homes in Kuala Lumpur and the Klang Valley. Each guide covers one problem and states the source and date of every cost figure.

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Send a correction

[/contact/ →](/contact/)

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## Related guides

Instant vs Storage Water Heater Choose between instant and storage water heaters for a KL condo or landed house: flow, pressure, bathrooms, space and booster pumps. Read guide arrow\_forward

[/guide/instant-vs-storage-water-heater/ →](/guide/instant-vs-storage-water-heater/)

 

Repair or Replace a Water Heater? Decide whether to repair or replace a water heater using age, the fault and safety, with the cost factors that matter. No made-up averages. Read guide arrow\_forward

[/guide/repair-or-replace-water-heater/ →](/guide/repair-or-replace-water-heater/)

 

Water Heater Keeps Tripping the Breaker Why water heaters trip the ELCB or RCCB: element faults, moisture and wiring. Stop using it, stay safe, and know who to call. Read guide arrow\_forward

[/guide/water-heater-tripping-breaker/ →](/guide/water-heater-tripping-breaker/)